<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <script src="./js/vue.js"></script>
    <title>何为数据代理</title>
</head>
<body>
    <div id="root">
       <!-- 数据代理，通过一个对象代理对另一个对象中的属性的操作 (读写) -->
    </div>
</body>
<script>
    let obj = {x : 100}
    let obj2 = {y: 200}
    //数据代理
    Object.defineProperty(obj2, 'x', {
        get() {
            return obj.x;
        },
        set(value) {
            obj.x = value;
        }
    });
</script>
</html>